Gree GMV-VQ680WM/C-X Service Manual page 180

Gree
Whether th e voltage at the output of the
main boar d is normal? (If th e voltage at the output does n ot
meet re quiremen ts, the output voltage of the fo ur-way valve
the high pressure and the low pressure of the
unit during operation is greater than 0.1 MPa? At the same
time touch the four-way valve by hand to see whether it is hot or cold. In
cooling mode, E pipe and S pipe are of low temperature and low pressure,
while D pipe and C pipe are of high temperature and high pressure; in
heating mode, D pipe and E pipe are of high temperature and
high pressure, while S pipe and C pipe are
Confirm that the four-way valve is abno rmal
"J7" Four-way Va lve Air
Backflo w Protection
Whether th e four-way valve
coil is connected to the ma in
boa rd p roperl y?
Yes
is 220V when it is e nergized)
Yes
Whether the difference between
of low temperature and low pressure.
Yes
Yes
Replace th e 4-way valve
GMV6 HR DC Inverter VRF Units Service Manual
No
Conne ct them prope rly and
No
178
relia bly
Replace th e main control
boa rd